.mt16 {
    margin-top: 16px;
}
.action_block {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.master_list {
    height: calc(100vh - 208px);
}
.btns button{
    margin-right: 10px;
}
.thumbnail > img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin-right: 10px;
}
.mr8{
    margin-right: 8px;
}